return {
{
    "tpope/vim-markdown",
    config = function()
      -- tpope/vim-markdown
      vim.g.markdown_syntax_conceal = 0
      vim.g.markdown_fenced_languages =
      { "html", "python", "bash=sh", "json", "java", "js=javascript", "sql", "yaml", "xml", 
        "swift", "javascript", 'lua' }
    end,
}, --> syntax highlighting and filetype plugins for Markdown -- markdown里代码块高亮。
{
    "bullets-vim/bullets.vim",
    config = function()
      vim.g.bullets_enabled_file_types = { "markdown", "text", "gitcommit", "scratch" }
    end,
},  -- 一个辅助list的插件
-- {
--     "iamcco/markdown-preview.nvim",
--     ft = { "markdown" },
--     build = function(plugin)
--         if vim.fn.executable "npx" then
--             vim.cmd("!cd " .. plugin.dir .. " && cd app && npx --yes yarn install && cnpm install")
--         else
--             vim.cmd [[Lazy load markdown-preview.nvim]]
--             vim.fn["mkdp#util#install"]()
--         end
--     end,
--     cmd = { "MarkdownPreviewToggle", "MarkdownPreview", "MarkdownPreviewStop" },
--     config = function()
--         -- set to 1, nvim will open the preview window after entering the Markdown buffer
--         -- default: 0
--         vim.g.mkdp_auto_start = 0
--         vim.g.mkdp_theme = 'light'
--         
--         -- set to 1, the nvim will auto close current preview window when changing
--         -- from Markdown buffer to another buffer
--         -- default. 1
--         vim.g.mkdp_auto_close = 0
--         
--         -- set to 1, Vim will refresh Markdown when saving the buffer or
--         -- when leaving insert mode. Default 0 is auto-refresh Markdown as you edit or
--         -- move the cursor
--         -- default. 0
--         vim.g.mkdp_refresh_slow = 1
--         
--         -- set to 1, the MarkdownPreview command can be used for all files,
--         -- by default it can be use in Markdown files only
--         -- default. 0
--         vim.g.mkdp_command_for_global = 0
--         
--         -- set to 1, the preview server is available to others in your network.
--         -- By default, the server listens on localhost (127.0.0.1)
--         -- default. 0
--         vim.g.mkdp_open_to_the_world = 0
--         
--         -- use custom IP to open preview page.
--         -- Useful when you work in remote Vim and preview on local browser.
--         -- For more details see. https://github.com/iamcco/markdown-preview.nvim/pull/9
--         -- default empty
--         vim.g.mkdp_open_ip = ''
--         
--         -- specify browser to open preview page
--         -- for path with space
--         -- valid. `/path/with\ space/xxx`
--         -- invalid. `/path/with\\ space/xxx`
--         -- default. ''
--         -- vim.g.mkdp_browser = 'C:/Program Files (x86)/Microsoft/Edge/Application/msedge.exe'
--         vim.g.mkdp_browser = 'C:/Program Files/Google/Chrome/Application/chrome.exe'
--         
--         -- set to 1, echo preview page URL in command line when opening preview page
--         -- default is 0
--         vim.g.mkdp_echo_preview_url = 1
--         
--         -- a custom Vim function name to open preview page
--         -- this function will receive URL as param
--         -- default is empty
--         vim.g.mkdp_browserfunc = ''
--         
--         -- options for Markdown rendering
--         -- mkit. markdown-it options for rendering
--         -- katex. KaTeX options for math
--         -- uml. markdown-it-plantuml options
--         -- maid. mermaid options
--         -- disable_sync_scroll. whether to disable sync scroll, default 0
--         -- sync_scroll_type. 'middle', 'top' or 'relative', default value is 'middle'
--         --   middle. means the cursor position is always at the middle of the preview page
--         --   top. means the Vim top viewport always shows up at the top of the preview page
--         --   relative. means the cursor position is always at relative positon of the preview page
--         -- hide_yaml_meta. whether to hide YAML metadata, default is 1
--         -- sequence_diagrams. js-sequence-diagrams options
--         -- content_editable. if enable content editable for preview page, default: v:false
--         -- disable_filename. if disable filename header for preview page, default: 0
--         vim.g.mkdp_preview_options = ([[
--             'mkit' = {},
--             'katex' = {},
--             'uml' = {},
--             'maid' = {},
--             'disable_sync_scroll' = 0,
--             'sync_scroll_type' = 'middle',
--             'hide_yaml_meta' = 0,
--             'sequence_diagrams' = {},
--             'flowchart_diagrams' = {},
--             'content_editable' = v:false,
--             'disable_filename' = 0,
--             'toc' = {}
--         ]])
--         
--         -- use a custom Markdown style. Must be an absolute path
--         -- like '/Users/username/markdown.css' or expand('~/markdown.css')
--         vim.g.mkdp_markdown_css = ''
--         
--         -- use a custom highlight style. Must be an absolute path
--         -- like '/Users/username/highlight.css' or expand('~/highlight.css')
--         vim.g.mkdp_highlight_css = ''
--         
--         -- use a custom port to start server or empty for random
--         vim.g.mkdp_port = ''
--         
--         -- preview page title
--         -- ${name} will be replace with the file name
--         vim.g.mkdp_page_title = '「${name}」'
--         
--         -- use a custom location for images
--         -- vim.g.mkdp_images_path = /home/user/.markdown_images
--         
--         -- recognized filetypes
--         -- these filetypes will have MarkdownPreview... commands
--         -- vim.g.mkdp_filetypes = ([['markdown']])
--         
--         -- set default theme (dark or light)
--         -- By default the theme is defined according to the preferences of the system
--         vim.g.mkdp_theme = 'dark'
--         
--         -- combine preview window
--         -- default. 0
--         -- if enable it will reuse previous opened preview window when you preview markdown file.
--         -- ensure to set vim.g.mkdp_auto_close = 0 if you have enable this option
--         vim.g.mkdp_combine_preview = 0
--         
--         -- auto refetch combine preview contents when change markdown buffer
--         -- only when g.mkdp_combine_preview is 1
--         vim.g.mkdp_combine_preview_auto_refresh = 1
--     end
--     },
}
